Suitability of watershed models to predict distributed hydrologic response in the Awramba Watershed in Lake Tana Basin

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cg.contributor.affiliationInternational Water Management Institute
cg.contributor.crpWater, Land and Ecosystems
cg.coverage.countryEthiopia
cg.coverage.iso3166-alpha2ET
cg.coverage.regionAfrica
cg.coverage.regionEastern Africa
cg.creator.identifierSeifu Tilahun: 0000-0002-5219-4527
cg.identifier.doihttps://doi.org/10.1002/ldr.2608
cg.issn1085-3278
cg.issn1099-145X
cg.issue4
cg.journalLand Degradation and Development
cg.volume28
dc.contributor.authorMoges, M.A.
dc.contributor.authorSchmitter, Petra S.
dc.contributor.authorTilahun, Seifu A.
dc.contributor.authorLangan, Simon J.
dc.contributor.authorDagnew, D.C.
dc.contributor.authorAkal, Adugnaw T.
dc.contributor.authorSteenhuis, Tammo S.
dc.date.accessioned2016-12-29T07:37:24Zen
dc.date.available2016-12-29T07:37:24Zen
dc.identifier.urihttps://hdl.handle.net/10568/78547
dc.titleSuitability of watershed models to predict distributed hydrologic response in the Awramba Watershed in Lake Tana Basinen
dcterms.abstractPlanning effective landscape interventions is an important tool to fight against land degradation and requires knowledge on spatial distribution of runoff. The objective of this paper was to test models that predict temporal and spatial distribution of runoff. The selected models were PED-WM, HBV-IHMS and SWAT. We choose 7 km2 Awramba watershed in the Lake Tana basin with detailed hydrological information for testing these models. Discharge at the outlet, rainfall and distributed information on infiltration rates, water table and extent of the saturated area were collected from 2013 to 2015. The maximum saturated area was 6.5% of the watershed. Infiltration rates exceeded rainfall intensities 91% of the time. Hence saturation excess runoff was the main runoff mechanism. Models were calibrated for the rainy seasons 2013, 2014 and validated for 2015. For daily flow validation, the PED-WM model (Nash Sutcliff efficiency, NSE = 0.61) outperformed HBV-IHMS (NSE = 0.51) and SWAT (NSE = 0.48). Performance on monthly time step was similar. Difference in model behavior depended on runoff mechanism. In PED-WM saturation excess is the main direct runoff process and could predict the maximum extent of the saturated area closely at 6.9%. HBV-IHMS model runoff simulation depended on soil moisture status and evapotranspiration, and hence was able to simulate saturation excess flow but not the extent of the saturated area. In SWAT where infiltration excess is the main runoff mechanism could only predict the monthly discharges well. This study shows that prevailing runoff mechanisms and distribution of runoff source areas should be used for proper model selection.en
dcterms.accessRightsOpen Access
dcterms.available2016-11-23
dcterms.bibliographicCitationMoges, M. A.; Schmitter, Petra; Tilahun, S. A.; Langan, Simon; Dagnew, D. C.; Akale, A. T.; Steenhuis, T. S. 2016. Suitability of watershed models to predict distributed hydrologic response in the Awramba Watershed in Lake Tana Basin. Land Degradation and Development, 43p. (Online first) doi: 10.1002/ldr.2608en
dcterms.extentp. 1386-1397
dcterms.issued2017-05
dcterms.languageen
dcterms.licenseCopyrighted; all rights reserved
dcterms.publisherWiley
dcterms.subjectwatershed managementen
dcterms.subjecthydrologyen
dcterms.subjectcatchment areasen
dcterms.subjectmodelsen
dcterms.subjectland degradationen
dcterms.subjectriver basin managementen
dcterms.subjectspatial distributionen
dcterms.subjectrainfall-runoff relationshipsen
dcterms.subjectinfiltration wateren
dcterms.subjectwet seasonen
dcterms.subjectcalibrationen
dcterms.subjectgroundwateren
dcterms.subjectwater tableen
dcterms.subjectwater levelsen
dcterms.typeJournal Article

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